JP7429719B2 - Batteries, power consumption equipment, battery manufacturing methods and devices - Google Patents

Description

Embodiments of the present application relate to the field of batteries, and more particularly to batteries, power consuming devices, and methods and apparatus for manufacturing batteries.

Energy conservation and emission reduction are the keys to sustainable development of the automobile industry. In this case, electric vehicles become an important part of the sustainable development of the automobile industry due to their energy-saving and environmentally friendly advantages. For electric vehicles, battery technology is an important element related to their development.

In the development of battery technology, in addition to improving battery performance, safety issues must not be ignored. If battery safety issues cannot be ensured, the battery cannot be used. Therefore, how to improve the safety of batteries is an urgent issue in battery technology.

Embodiments of the present application provide a battery, a power consuming device, a method and apparatus for manufacturing the battery, and can improve the safety of the battery.

According to a first aspect, a battery is provided, the battery cell including a pressure relief mechanism, at least a portion of the pressure relief mechanism protruding from a first wall of the battery cell, and the pressure relief mechanism is A battery cell that is activated to release the internal pressure when the internal pressure or temperature of the cell reaches a threshold value, and a thermal management member that accommodates a fluid and adjusts the temperature of the battery cell. , a first surface of the thermal management member is attached to the first wall of the battery cell, and a relief cavity is provided in the first surface of the thermal management member for accommodating the at least a portion of the pressure relief mechanism. will be installed.

In the technical solution of the embodiments of the present application, an escape cavity is installed on the first surface of the thermal management member for accommodating at least a part of the pressure relief mechanism. In this way, the first wall of the battery cell can be tightly pasted on the surface of the thermal management member, which on the one hand facilitates the fixation of the battery cell, saves space and improves the thermal management efficiency, On the other hand, when the pressure release mechanism is activated, the battery cell exhaust can be discharged towards the escape cavity and away from the battery cell, reducing its danger and thereby improving the safety of the battery. be able to.

In some embodiments, a portion of the first wall around the pressure relief mechanism protrudes outward, and the relief cavity is further used to accommodate the protrusion portion of the first wall around the pressure relief mechanism. It will be done.

When the portion of the first wall around the pressure relief mechanism protrudes outward, the relief cavity can ensure that the first wall of the battery cell is tightly affixed to the surface of the thermal management member, thereby It can facilitate the fixation of battery cells, and can further save space and improve thermal management efficiency.

In some embodiments, the relief cavity is arranged to provide a deformation space for the pressure relief mechanism to allow the pressure relief mechanism to deform and rupture toward the thermal management member.

By installing the escape cavity, the pressure relief mechanism can be deformed and ruptured toward the thermal management member, so that the battery cell waste can be discharged toward the escape cavity and far away from the battery cell. .

In some embodiments, the depth of the relief cavity is related to the dimensions of the pressure relief mechanism.

In some embodiments, the depth of the relief cavity is greater than 1 mm.

In some embodiments, a thinned region is installed on the bottom wall of the relief cavity, and the thinned region is destroyed by the exhaust ejected from the interior of the battery cell when the pressure relief mechanism is activated. , arranged to allow the exhaust to pass through the thinning region.

The bottom wall of the escape cavity is thinner than other areas of the thermal management member and is susceptible to destruction by the exhaust, so when the pressure relief mechanism is activated, the exhaust will break through the bottom wall of the escape cavity and pass through the thermal management member. can do.

In some embodiments, the thinned region has a thickness of 3 mm or less.

In some embodiments, the thinned region has a lower melting point than other portions of the thermal management member.

In some embodiments, the material employed by the thinned region has a melting point below 400°C.

In some embodiments, the thermal management member includes a first thermally conductive plate and a second thermally conductive plate, and the first thermally conductive plate is located between the first wall and the second thermally conductive plate. and attached to the first wall, a first region of the first heat-conducting plate is recessed into the second heat-conducting plate to form the escape cavity, and the first region is connected to the second heat-conducting plate. Ru.

In some embodiments, a through hole is provided in the first region, and the radial dimension of the through hole is smaller than the radial dimension of the relief cavity.

In some embodiments, the thickness of the second heat conductive plate corresponding to the through hole is smaller than the thickness of the second heat conductive plate in other areas. In this way, the thinned region becomes more susceptible to destruction by the exudates.

In some embodiments, a portion of the thermal management member around the escape cavity may be disrupted by exhaust emitted from the interior of the battery cell, causing the fluid to exit from the interior of the thermal management member. can.

When the pressure relief mechanism is actuated, the thermal management member is destroyed and fluid is discharged from the interior of the thermal management member, thus absorbing the heat of the battery cells and reducing the temperature of the effluent. can further reduce the risk of emissions.

In some embodiments, sides of the escape cavity can be ruptured by the exudate to allow the fluid to exit from the interior of the thermal management member.

When the pressure release mechanism is activated, the discharge of the battery cell enters the escape cavity, and because the bottom wall of the escape cavity is thin, the discharge destroys the bottom wall of the escape cavity and passes through the thermal management member; The effluent that is forced into the escape cavity further simultaneously melts the sides of the escape cavity, causing fluid to exit the interior of the thermal management member, thereby reducing the temperature of the hot effluent.

In some embodiments, the radial dimension of the relief cavity gradually decreases in a direction away from the pressure relief mechanism. In this way, the contact area with the waste can be increased, making it easier to be destroyed by said waste.

In some embodiments, an electrode terminal is installed on a second wall of the battery cell, and the second wall is different from the first wall.

By installing the pressure relief mechanism and the electrode terminal on different walls of the battery cell, when the pressure relief mechanism is activated, the battery cell effluent can be further away from the electrode terminal, thereby separating the effluent from the electrode terminal and the bus. The impact on the components can be reduced and therefore the safety of the battery can be improved.

In some embodiments, the second wall is located opposite the first wall.

In some embodiments, the pressure relief mechanism is a temperature sensitive pressure relief mechanism, and the temperature sensitive pressure relief mechanism is arranged to melt if the internal temperature of the battery cell reaches a threshold value. and/or the pressure relief mechanism is a pressure sensitive pressure relief mechanism, and the pressure sensitive pressure relief mechanism is arranged to rupture if the internal air pressure of the battery cell reaches a threshold value.

In some embodiments, the battery further includes an electrical cavity for accommodating a plurality of the battery cells and for collecting emissions expelled from the interior of the battery cells when the pressure relief mechanism is actuated. a collection cavity, the thermal management member being used to separate the electrical cavity and the collection cavity.

A thermal management member separates the electrical cavity for accommodating the battery cells and the collection cavity for collecting emissions, such that when the pressure relief mechanism is actuated, the emissions of the battery cells enter the collection cavity and flow into the electrical cavity. It can enter the electrical cavity without or in a small amount, thereby not affecting the electrical connections inside the electrical cavity, thus improving the safety of the battery.

In some embodiments, the thermal management member has a wall shared by the electrical cavity and the collection cavity.

Since the thermal management member is used as a wall shared by the electrical cavity and the collection cavity, it is possible to separate the emissions and the electrical cavity as much as possible, thereby reducing the risk of emissions and preventing battery damage. Improve safety.

In some embodiments, the battery further includes a protection member, the protection member being used to protect the thermal management member, and the protection member and the thermal management member forming the collection cavity.

The collection cavity formed by the protection member and the thermal management member can effectively collect and buffer the exhaust, reducing its risk.

In some embodiments, the electrical cavity is separated from the collection cavity by the thermal management member.

The collection cavity and the electric cavity are not in communication, and liquid or gas etc. in the collection cavity cannot enter the electric cavity, thereby better protecting the electric cavity.

In some embodiments, the thermal management member is ruptured by the exhaust when the pressure relief mechanism is actuated to allow the exhaust to pass through the thermal management member and into the collection cavity. will be placed in

According to a second aspect, a power consumption device including the battery of the first aspect is provided.

In some embodiments, the power consuming device is a vehicle, a ship, or a spacecraft.

According to a third aspect, there is provided a method for manufacturing a battery, the step of providing a battery cell, wherein the battery cell includes a pressure relief mechanism, and at least a portion of the pressure relief mechanism is located at a first side of the battery cell. protruding from a wall, the pressure relief mechanism is used to actuate and release the internal pressure when the internal pressure or temperature of the battery cell reaches a threshold; providing a thermal management member having a relief cavity disposed thereon; adhering the first surface of the thermal management member to the first wall of the battery cell; and providing the relief cavity with the pressure relief mechanism. accommodating at least a portion thereof.

In some embodiments, a portion of the first wall around the pressure relief feature protrudes outward, and the escape cavity accommodates the protrusion portion of the first wall around the pressure relief feature.

In some embodiments, the relief cavity can provide a deformation space for the pressure relief mechanism to deform and rupture the pressure relief mechanism toward the thermal management member.

In some embodiments, a thinned region is installed on the bottom wall of the relief cavity, and the thinned region is destroyed by the exhaust ejected from the interior of the battery cell when the pressure relief mechanism is activated. , arranged to allow the exhaust to pass through the thinning region.

In some embodiments, a portion of the thermal management member around the escape cavity may be disrupted by exhaust emitted from the interior of the battery cell, causing the fluid to exit from the interior of the thermal management member. can.

According to a fourth aspect, there is provided a battery manufacturing apparatus including a module that executes the method of the third aspect.
The drawings described herein are used to further understand and constitute a part of this application, and the illustrative embodiments of this application and their descriptions are used to interpret this application and are incorporated herein by reference. It does not constitute a limitation.

1 is a schematic diagram of a vehicle according to one embodiment of the present application. FIG. 1 is a schematic structural diagram of a battery according to one embodiment of the present application. FIG. 1 is a schematic structural diagram of a battery module according to one embodiment of the present application. 1 is an exploded view of a battery cell of one embodiment of the present application; FIG. FIG. 3 is an exploded view of a battery cell according to another embodiment of the present application. FIG. 1 is a schematic structural diagram of a battery according to one embodiment of the present application. 1 is a schematic plan view of a battery according to one embodiment of the present application; FIG. Figure 7a is a schematic cross-sectional view along AA of the battery shown in Figure 7a; Figure 7b is an enlarged view of part B of the battery shown in Figure 7b; 1 is a schematic perspective view of a thermal management member of one embodiment of the present application; FIG. 8a is a schematic cross-sectional view along line AA of the thermal management member of FIG. 8a; FIG. 1 is an exploded view of a thermal management member of one embodiment of the present application; FIG. FIG. 2 is a schematic structural diagram of a battery according to some embodiments of the present application. FIG. 2 is a schematic structural diagram of a battery according to some embodiments of the present application. FIG. 2 is a schematic structural diagram of a battery according to some embodiments of the present application. FIG. 2 is a schematic structural diagram of a battery according to some embodiments of the present application. FIG. 2 is a schematic structural diagram of a battery according to some embodiments of the present application. FIG. 2 is a schematic structural diagram of a battery according to some embodiments of the present application. 1 is an exploded view of a battery of one embodiment of the present application; FIG. 1 is an exemplary flowchart of a method of manufacturing a battery according to one embodiment of the present application. FIG. 1 is an exemplary block diagram of a battery manufacturing apparatus according to one embodiment of the present application.

In order to make the objectives, technical solutions and advantages of the embodiments of the present application more clear, the technical solutions of the embodiments of the present application will be clearly explained below with reference to the drawings of the embodiments of the present application, and the description will be clear. The embodiments described are some but not all embodiments of the present application. Based on the embodiments of this application, all other embodiments that a person skilled in the art may obtain without any creative effort will fall within the protection scope of this application.

Unless otherwise defined, all technical and scientific terms used in this application have the same meanings as commonly understood by one of ordinary skill in the art. In the present application, the terminology used in the specification of the application is for the purpose of describing specific embodiments only and is not intended to limit the application. The terms "comprising," "having," and any variations thereof as used in the specification, claims, and brief description of the drawings are intended to cover non-exclusive inclusion. The terms "first", "second", etc. used in the specification and claims of the present application or the above-mentioned drawings are used to distinguish between different objects, and to explain a specific order or master-servant relationship. It is not particularly used.

A reference to an "embodiment" in this application means that a particular feature, structure, or characteristic described with reference to the embodiment may be included in at least one embodiment of the application. The appearances of the phrase in various places in the specification are not necessarily referring to the same embodiment, nor are they mutually exclusive independent or alternative embodiments of other embodiments. Those skilled in the art can understand, both explicitly and implicitly, that the embodiments described in this application can be combined with other embodiments.

In the description of this application, it is necessary to explain that the terms "attachment", "coupling", "connection", "attachment" should be understood in a broad sense, unless otherwise clearly specified and limited. For example, they may be fixedly connected, removably connected, or integrally connected, directly coupled, or indirectly coupled via an intermediate medium; It may also be communication between the insides of two elements. Those skilled in the art can understand the specific meanings of the above terms in this application depending on the specific situation.

The term "and/or" in this application merely describes an association relationship of related objects, indicating that three relationships may exist, e.g., A and/or B means that A exists alone. shows three situations in which A and B exist simultaneously and B exists alone. Further, the symbol "/" in the present application generally indicates that related objects before and after the object have an "or" relationship.

"Plurality" appearing in this application refers to two or more (including two), similarly, "multiple sets" refers to two or more sets (including two sets), and "multiple sheets" refers to two or more (including two) ).

In the present application, the battery cell may include a lithium ion secondary battery, a lithium ion primary battery, a lithium sulfur battery, a sodium lithium ion battery, a sodium ion battery, a magnesium ion battery, etc., and the embodiments of the present application are not limited thereto. The battery cell may have a cylindrical shape, a flat shape, a rectangular parallelepiped shape, or other shapes, and the embodiments of the present application are not limited thereto. Battery cells are generally divided into three types depending on the packaging method: cylindrical battery cells, prismatic battery cells, and soft pack battery cells, and the embodiments of the present application are not limited thereto.

A battery referred to in the embodiments of this application refers to a single physical module that includes one or more battery cells and provides higher voltage and capacity. For example, the batteries referred to in this application may include battery modules, battery packs, and the like. Batteries typically include a box for packaging one or more battery cells. The box can prevent liquid or other foreign objects from affecting the charging or discharging of the battery cells.

A battery cell includes an electrode assembly and an electrolyte, and the electrode assembly is composed of a positive electrode plate, a negative electrode plate, and a separator. Battery cells primarily rely on the movement of metal ions between positive and negative plates to operate. The positive electrode plate includes a positive electrode current collector and a positive electrode active material layer, the positive electrode active material layer is coated on the surface of the positive electrode current collector, and the current collector that is not coated with the positive electrode active material layer is coated with the positive electrode active material layer. The current collector that protrudes from the current collector and is not coated with the positive electrode active material layer is used as a positive electrode tab. Taking a lithium ion battery as an example, the material of the positive electrode current collector may be aluminum, and the positive electrode active material may be lithium cobalt oxide, lithium iron phosphate, ternary lithium, lithium manganate, or the like. The negative electrode plate includes a negative electrode current collector and a negative electrode active material layer, the negative electrode active material layer is coated on the surface of the negative electrode current collector, and the current collector that is not coated with the negative electrode active material layer is coated with the negative electrode active material layer. The current collector that protrudes from the current collector and is not coated with the negative electrode active material layer is used as a negative electrode tab. The material of the negative electrode current collector may be copper, and the negative electrode active material may be carbon, silicon, or the like. To ensure that high current flows without blowout, the positive tabs are stacked together in multiple numbers, and the negative tabs are stacked together in multiple numbers. The material of the separator may be PP or PE. Further, the electrode assembly may have a wound structure or a laminated structure, and the embodiments of the present application are not limited thereto. The development of battery technology requires simultaneous consideration of various design factors, such as performance parameters such as energy density, cycle life, discharge capacity, and charging/discharging speed, as well as battery safety.

For battery cells, the main safety hazards come from the charging and discharging process, and at the same time, appropriate environmental temperature design is also necessary, and in order to effectively avoid unnecessary losses, the main safety hazards for battery cells are There are generally at least three safeguards. In particular, the protection means include at least a switching element, selection of a suitable separator material, and a pressure relief mechanism. A switching element refers to an element that can stop charging or discharging a battery when the temperature or resistance within the battery cell reaches a predetermined threshold. The separator is used to separate the positive and negative electrode plates, and when the temperature rises to a predetermined value, it can automatically dissolve the microscale (and nanoscale) pores attached to the separator. This prevents metal ions from passing through the separator, stopping the reaction inside the battery cell.

A pressure release mechanism refers to an element or member that is activated to release internal pressure or temperature when the internal pressure or temperature of a battery cell reaches a predetermined threshold. The design of the threshold varies depending on different design needs. The threshold value may be determined by one or more materials selected from the positive electrode plate, negative electrode plate, electrolyte, and separator of the battery cell. The pressure relief mechanism may take the form of, for example, an explosion-proof valve, a pneumatic valve, a pressure release valve or a safety valve, and may specifically adopt pressure- or temperature-sensitive elements or structures, i.e., battery cells. When the internal pressure or temperature of the pressure relief mechanism reaches a predetermined threshold value, the pressure relief mechanism performs an operation or the thinning structure provided in the pressure relief mechanism is destroyed, thereby opening an opening for relief of the internal pressure or temperature. Or form a channel.

"Activation" as referred to herein refers to the fact that the pressure relief mechanism is activated or activated to a predetermined state, thereby relieving the internal pressure and temperature of the battery cell. Action of the pressure relief mechanism includes, but is not limited to, rupturing, fracturing, tearing, or opening of at least a portion of the pressure relief mechanism. When the pressure release mechanism is activated, high-temperature and high-pressure substances inside the battery cell are discharged from the activated region as exhaust. In this way, the pressure of the battery cells can be released in situations where the pressure or temperature can be controlled, thereby avoiding the occurrence of potential more serious accidents.

The emissions from the battery cells referred to in this application include, but are not limited to, electrolyte, dissolved or separated positive and negative plates, separator fragments, high temperature and high pressure gases in which reactions occur, flames, etc.

The pressure relief mechanism of battery cells has a serious impact on battery safety. For example, when a phenomenon such as a short circuit or overcharging occurs, thermal runaway may occur inside the battery cell, causing a sudden increase in pressure or temperature. In this situation, by activating the pressure release mechanism, the internal pressure and temperature can be released to the outside, thereby preventing the battery cell from exploding or catching fire.

Conventional pressure relief mechanism designs mainly focus on releasing the high pressure and high heat inside the battery cell, that is, discharging the wastes to the outside of the battery cell. However, in order to ensure the output voltage or current of the battery, a plurality of battery cells are always required, and the plurality of battery cells are electrically connected by bus members. The waste discharged from the inside of the battery cell may cause the occurrence of a short circuit phenomenon in the remaining battery cells. For example, if the discharged metal scrap is electrically connected to two bus members, the battery This can lead to the occurrence of short circuits and therefore a safety problem exists. The high-temperature and high-pressure exhaust is then discharged in the direction in which the pressure release mechanism of the battery cell is installed, more specifically in the direction in which the pressure relief mechanism is activated. The force and destructive force of the ejecta can be very large and may even penetrate one or more structures in that direction, creating further safety issues.

In view of this, the embodiments of the present application provide a technical solution, which installs an escape cavity on the surface of the thermal management member to accommodate at least a part of the pressure relief mechanism, and when the pressure relief mechanism is activated, the battery cell The emissions can be discharged towards the escape cavity and away from the battery cells, reducing its risk and thereby improving the safety of the battery.

The thermal management member is used to contain fluid and regulate the temperature of the plurality of battery cells. The fluid here may be a liquid or a gas, and regulating the temperature refers to heating or cooling the plurality of battery cells. When cooling or reducing the temperature of battery cells, the thermal management member is used to contain a cooling fluid to reduce the temperature of a plurality of battery cells, and in this case, the thermal management member is a cooling member, a cooling system, etc. Alternatively, the fluid contained therein may be called a cooling medium or a cooling fluid, and more specifically, a cooling liquid or a cooling gas. Further, the thermal management member may be used to heat and increase the temperature of a plurality of battery cells, and the embodiments of the present application are not limited thereto. Optionally, the fluid may flow in a circular manner, thereby achieving a better temperature regulating effect. Optionally, the fluid may be water, a mixture of water and ethylene glycol, air, or the like.

The electrical cavities referred to herein are used to house a plurality of battery cells and bus members. The electrical cavity may be sealed or unsealed. The electrical cavity provides space for mounting battery cells and bus members. In some embodiments, the electrical cavity may further include structure for securing the battery cells. The shape of the electrical cavity can vary depending on the number of battery cells and bus members accommodated. In some embodiments, the electrical cavity is square and has six walls. Since the battery cells in the electrical cavity form a high output voltage through electrical connections, the electrical cavity is also referred to as a "high voltage cavity."

The bus member mentioned in this application is used to realize an electrical connection of a plurality of battery cells, for example a parallel connection or a series connection or a hybrid connection. The bus member can realize electrical connection between battery cells by connecting the electrode terminals of the battery cells. In some embodiments, the bus member may be secured to the battery cell electrode terminal by welding. Corresponding to the "high voltage cavity", the electrical connections made with the bus member are also referred to as "high voltage connections".

The collection cavities referred to in this application are used to collect exudates and may be sealed or unsealed. In some embodiments, air or other gas may be included within the collection cavity. The collection cavity has no electrical connections connected to the voltage output and is also referred to as a "low voltage cavity" in correspondence with the "high voltage cavity". Optionally or additionally, a liquid, for example a cooling medium, may be included in said collection cavity, or a member may be provided for containing said liquid, so that the discharge entering the collection cavity Further reduce the temperature of objects. Further optionally, the gas or liquid within the collection cavity is cyclically flowing.

The technical solutions described in the embodiments of this application are all applicable to various devices that use batteries, such as mobile phones, portable devices, notebook computers, electric bicycles, electric toys, power tools, electric cars, ships, and spacecraft. For example, spacecraft include airplanes, rockets, space shuttles, spacecraft, and the like.

As can be understood, the technical solutions described in the embodiments of the present application are not only applicable to the devices described above, but also applicable to all devices using batteries, but for the sake of brevity, the following All of the embodiments will be explained using an electric vehicle as an example.

For example, as shown in FIG. 1, this is a structural schematic diagram of a vehicle 1 in one embodiment of the present application, and the vehicle 1 may be a fuel vehicle, a fuel gas vehicle, or a new energy vehicle, and the vehicle 1 may be a fuel vehicle, a fuel gas vehicle, or a new energy vehicle. The vehicle may be a pure electric vehicle, a hybrid vehicle, a range extender electric vehicle, or the like. A motor 40, a controller 30, and a battery 10 may be installed inside the vehicle 1, and the controller 30 is used to control the battery 10 and supply power to the motor 40. For example, the battery 10 may be installed at the bottom of the vehicle 1, at the front end of the vehicle, or at the rear end of the vehicle. The battery 10 is used to supply power to the vehicle 1, for example, the battery 10 is used as an operating power source for the vehicle 1, and can be applied to the circuit system of the vehicle 1, for example, for starting, navigation, and operation of the vehicle 1 while driving. It is used to meet electricity demand. In other embodiments of the present application, the battery 10 may not only be used as an operating power source for the vehicle 1, but also replace or partially replace fuel or natural gas as a driving power source for the vehicle 1. can be provided.

In order to meet different power demands, the battery may include a plurality of battery cells, where the plurality of battery cells may be connected in series or in parallel or in a hybrid connection, and the hybrid connection is a combination of series connection and parallel connection. It is a mixture of Batteries are also called battery packs. Optionally, the plurality of battery cells are first connected in series or connected in parallel or hybridly connected to form a battery module, and then the plurality of battery modules are connected in series or connected in parallel or hybridly connected to form a battery. You may. That is, the plurality of battery cells may directly constitute a battery, or they may first constitute a battery module, and then the battery module may constitute a battery.

For example, as shown in FIG. 2, which is a structural schematic diagram of a battery 10 of one embodiment of the present application, the battery 10 may include a plurality of battery cells 20. The battery 10 may include a box (or a cover), and the inside of the box has a hollow structure, and the plurality of battery cells 20 are housed within the box. As shown in FIG. 2, the box may include two parts, referred to herein as a first part 111 and a second part 112, respectively, with the first part 111 and the second part 112 being fastened together. The shapes of the first portion 111 and the second portion 112 are determined based on the shape of the plurality of battery cells 20 combined, and both the first portion 111 and the second portion 112 may have one opening. For example, it is preferable that both the first part 111 and the second part 112 are hollow rectangular parallelepipeds, and only one face of each is an opening face, and the opening of the first part 111 and the opening of the second part 112 are placed opposite each other, and the first part 111 and the second part 112 are fastened together to form a box with a sealed chamber. After the plurality of battery cells 20 are connected in parallel, connected in series, or hybrid-connected to each other and combined, they are placed in a box formed by tightening the first part 111 and the second part 112.

Optionally, battery 10 may include further structures and will not be repeatedly described here. For example, the battery 10 may further include a bus member, and the bus member is used to realize an electrical connection of a plurality of battery cells 20, for example, a parallel connection, a series connection, or a hybrid connection. Specifically, the bus member can realize electrical connection of the battery cells 20 by connecting the electrode terminals of the battery cells 20. Furthermore, the bus member can be fixed to the electrode terminal of the battery cell 20 by welding. The electrical energy of the plurality of battery cells 20 may further be channeled through the box via an electrical conduction mechanism. Optionally, the electrical conduction mechanism may belong to the bus member.

The number of battery cells 20 may be set to an arbitrary value based on different power demands. A plurality of battery cells 20 can be connected in series, parallel, or hybrid to achieve large capacity or power. Since the number of battery cells 20 included in each battery 10 may be large, in order to facilitate installation, the battery cells 20 may be installed in groups, and each group of battery cells 20 may constitute a battery module. can. The number of battery cells 20 included in the battery module is not limited, and may be set according to demand. For example, FIG. 3 is an example of a battery module. A battery may include a plurality of battery modules, and these battery modules may be connected in a series, parallel or hybrid manner.

As shown in FIG. 4, this is a structural schematic diagram of a battery cell 20 of one embodiment of the present application, which includes one or more electrode assemblies 22, a housing 211, and a cover plate 212. The coordinate system shown in FIG. 4 is the same as the coordinate system in FIG. Housing 211 and cover plate 212 form a shell or battery case 21 . The wall of the housing 211 and the cover plate 212 are both referred to as the wall of the battery cell 20. The housing 211 is determined based on the shape after combining one or more electrode assemblies 22, for example, the housing 211 may be a hollow rectangular parallelepiped, a cube, or a cylinder, and one side of the housing 211 is There is an opening through which one or more electrode assemblies 22 can be placed within the housing 211. For example, when the housing 211 is a hollow rectangular parallelepiped or cube, one plane of the housing 211 is an open plane, that is, there is no wall on the plane, and the inside and outside of the housing 211 can communicate with each other. When the housing 211 is a hollow cylindrical body, the end face of the housing 211 is an open face, that is, there is no wall on the end face, and the inside and outside of the housing 211 can communicate with each other. A cover plate 212 covers the opening and is connected to the housing 211 to form a closed cavity for placing the electrode assembly 22. The housing 211 is filled with an electrolyte, for example an electrolytic solution.

The battery cell 20 may further include two electrode terminals 214 , and the two electrode terminals 214 may be installed on the cover plate 212 . The cover plate 212 generally has a flat shape, and two electrode terminals 214 are fixed to the flat surface of the cover plate 212, and the two electrode terminals 214 are a positive terminal 214a and a negative terminal 214b, respectively. One connecting member 23 is installed correspondingly to each electrode terminal 214, or called a current collecting member 23, which is located between the cover plate 212 and the electrode assembly 22, and is connected to the electrode assembly 22 and the electrode terminal 214. Used to realize electrical connections.

As shown in FIG. 4, each electrode assembly 22 has a first tab 221a and a second tab 222a. The first tab 221a and the second tab 222a have opposite polarities. For example, when the first tab 221a is a positive electrode tab, the second tab 222a is a negative electrode tab. A first tab 221a of one or more electrode assemblies 22 is connected to one electrode terminal via one connecting member 23, and a second tab 222a of one or more electrode assemblies 22 is connected to another connecting member 23. Connected to other electrode terminals via. For example, the positive electrode terminal 214a is connected to the positive electrode tab via one connecting member 23, and the negative electrode terminal 214b is connected to the negative electrode tab via the other connecting member 23.

In the battery cell 20, a single electrode assembly 22 or a plurality of electrode assemblies 22 may be installed according to actual usage requirements, and as shown in FIG. 4, there are four independent electrode assemblies 22 in the battery cell 20. will be installed.

As shown in FIG. 5, it is a structural schematic diagram of a battery cell 20 including a pressure release mechanism 213 of another embodiment of the present application.

The housing 211, cover plate 212, electrode assembly 22 and connecting member 23 of FIG. 5 correspond to the housing 211, cover plate 212, electrode assembly 22 and connecting member 23 of FIG. 4 and are repeated here for brevity. Don't explain.

A pressure release mechanism 213 may also be installed on one wall of the battery cell 20, for example the first wall 21a shown in FIG. For ease of explanation, the first wall 21a and the housing 211 are separated in FIG. 5, but the opening is not limited to the bottom side of the housing 211. The pressure release mechanism 213 is used to operate and release the internal pressure or temperature when the internal pressure or temperature of the battery cell 20 reaches a threshold value.

The pressure release mechanism 213 may be a part of the first wall 21a, or may have a split structure with the first wall 21a, and may be fixed to the first wall 21a by, for example, welding. When the pressure release mechanism 213 is a part of the first wall 21a, for example, the pressure release mechanism 213 may be formed by installing a notch in the first wall 21a, and the first wall 21a corresponding to the notch The thickness of the pressure release mechanism 213 is smaller than the thickness of other areas other than the notch. The location of the notch is the thinnest location of the pressure relief mechanism 213. The gas generated by the battery cell 20 is so large that the internal pressure of the housing 211 becomes high and reaches a threshold value, or the interior of the battery cell 20 reacts and provides heat, thereby increasing the internal temperature of the battery cell 20. When the threshold is reached, the pressure relief mechanism 213 can rupture at the notch to establish communication between the interior and exterior of the housing 211, and the pressure and temperature of the gas are released to the outside upon the rupture of the pressure relief mechanism 213; Furthermore, explosion of the battery cells 20 is avoided.

Optionally, in one embodiment of the present application, if the pressure relief mechanism 213 is installed on the first wall 21a of the battery cell 20, as shown in FIG. 214 is installed, and the second wall is different from the first wall 21a.

Optionally, the second wall is installed opposite the first wall 21a. For example, the first wall 21a may be the bottom wall of the battery cell 20, and the second wall may be the top wall of the battery cell 20, ie, the cover plate 212.

Optionally, as shown in FIG. 5, the battery cell 20 may further include a pad 24 located between the electrode assembly 22 and the bottom wall of the housing 211 to support the electrode assembly 22. Furthermore, it can effectively prevent the electrode assembly 22 from interfering with the rounded corners around the bottom wall of the housing 211. In addition, one or more through holes may be installed in the pad 24, for example, a plurality of evenly arranged through holes may be installed, or the pressure relief mechanism 213 may be installed in the bottom wall of the housing 211. When installed in the pad, a through hole may be installed at a position corresponding to the pressure release mechanism 213, which can easily guide fluid and gas. The space between the upper surface and the lower surface of the pad 24 is communicated with each other, and both the gas and electrolyte generated inside the battery cell 20 can freely pass through the pad 24 .

By installing the pressure relief mechanism 213 and the electrode terminal 214 on different walls of the battery cell 20, when the pressure relief mechanism 213 is activated, the discharge of the battery cell 20 can be further away from the electrode terminal 214, thereby reducing the discharge. The influence of objects on the electrode terminals 214 and bus members can be reduced, thus improving the safety of the battery.

Furthermore, when the electrode terminal 214 is installed on the cover plate 212 of the battery cell 20, by installing the pressure release mechanism 213 on the bottom wall of the battery cell 20, when the pressure release mechanism 213 is activated, The waste is discharged towards the bottom of the battery 10. In this way, on the one hand, the risk of emissions can be reduced with thermal management elements etc. at the bottom of the battery 10, and on the other hand, since the bottom of the battery 10 is generally far away from the user, can reduce harm to people.

Pressure relief mechanism 213 may be any of a variety of possible pressure relief structures, and embodiments of the present application are not limited thereto. For example, the pressure relief mechanism 213 may be a temperature sensitive pressure relief mechanism, where the temperature sensitive pressure relief mechanism melts when the internal temperature of the battery cell 20 in which the pressure relief mechanism 213 is provided reaches a threshold value. and/or the pressure relief mechanism 213 may be a pressure sensitive pressure relief mechanism, wherein the pressure sensitive pressure relief mechanism is located within the battery cell 20 in which the pressure relief mechanism 213 is provided. Arranged to rupture if air pressure reaches a threshold.

FIG. 6 is a schematic diagram of a battery 10 according to one embodiment of the present application. As shown in FIG. 6, the battery 10 may include a battery cell 20 and a thermal management member 13.

The battery cell 20 includes a pressure release mechanism 213, at least a portion of the pressure release mechanism 213 protrudes from the first wall 21a of the battery cell 20, and the pressure release mechanism 213 releases when the internal pressure or temperature of the battery cell 20 reaches a threshold value. Used to activate and release internal pressure or temperature. For example, the battery cell 20 may be the battery cell 20 of FIG.

The heat management member 13 is used to accommodate fluid and adjust the temperature of the plurality of battery cells 20 . In the case of reducing the temperature of the battery cells 20, the heat management member 13 can accommodate a cooling medium to adjust the temperature of the plurality of battery cells 20. In this case, the heat management member 13 is a cooling member, a cooling system, etc. It is also called a cooling plate. The thermal management member 13 may also be used for heating, and the embodiments of the present application are not limited thereto. Optionally, the fluid may flow in a circular manner, thereby achieving a better temperature regulating effect.

A first surface (the upper surface shown in FIG. 6) of thermal management member 13 is attached to first wall 21a. That is, the wall on which the pressure release mechanism 213 of the battery cell 20 is installed is attached to the thermal management member 13 . An escape cavity 134 a is provided on the first surface of the thermal management member 13 , and the escape cavity 134 a is used to accommodate at least a portion of the pressure relief mechanism 213 .

When the pressure release mechanism 213 is installed on the first wall 21a of the battery cell 20, at least a portion of the pressure release mechanism 213 can protrude from the first wall 21a, and in this way, the pressure release mechanism 213 can be easily installed. In addition, the space inside the battery cell 20 can be secured. In the present embodiment, an escape cavity 134a is provided on the first surface of the thermal management member 13 for accommodating at least a portion of the pressure relief mechanism 213. In this way, the first wall 21a of the battery cell 20 can be tightly pasted on the surface of the thermal management member 13, which on the one hand facilitates the fixing of the battery cell 20, saves space and improves thermal management. On the other hand, when the pressure release mechanism 213 is activated, the discharge of the battery cell 20 can be discharged towards the escape cavity 134a and be far away from the battery cell 20, reducing the danger thereof; Thereby, battery safety can be improved.

Optionally, in one embodiment of the present application, the relief cavity 134a may be a groove, and the embodiment of the present application is not limited thereto.

Optionally, in one embodiment of the present application, a portion of the first wall 21a around the pressure relief feature 213 projects outwardly, and the escape cavity 134a further projects a portion of the first wall 21a around the pressure relief feature 213. Used for accommodating.

Similarly, when the portion of the first wall 21a around the pressure release mechanism 213 protrudes outward, the escape cavity 134a ensures that the first wall 21a of the battery cell 20 is tightly attached to the surface of the thermal management member 13. This makes it possible to easily fix the number of battery cells 20, thereby saving space and improving thermal management efficiency.

When the pressure release mechanism 213 is activated, it deforms and communicates between the inside and outside of the battery cell 20 . For example, for the pressure release mechanism 213 that adopts a notch, when the pressure release mechanism 213 is activated, it will rupture at the notch and open to both sides, and the pressure release mechanism 213 will correspondingly require a predetermined deformation space. shall be. Optionally, in one embodiment of the present application, relief cavity 134a provides a deformation space for pressure relief mechanism 213 to allow pressure relief mechanism 213 to deform toward thermal management member 13 and rupture. Placed. Correspondingly, the installation of the escape cavity 134a must satisfy the condition that it can be opened when the pressure release mechanism 213 is activated. Specifically, the depth of relief cavity 134a is related to the dimensions of pressure relief mechanism 213. In one embodiment of the present application, the depth of the relief cavity 134a is greater than 1 mm. For example, the depth of the escape cavity 134a may be 3 mm or more, thereby allowing the pressure relief mechanism 213 to be opened easily.

By installing the escape cavity 134a, the pressure release mechanism 213 can be deformed toward the thermal management member 13 and ruptured, so that the discharge of the battery cell 20 is discharged toward the escape cavity 134a and removed from the battery cell 20. You can go far away. Additionally, escape cavity 134a may be arranged to allow exhaust to pass through when pressure relief mechanism 213 is activated. In this way, the waste can be quickly exhausted through the thermal management member 13 and away from the battery cell 20, reducing its risk and thereby improving the safety of the battery. .

Optionally, as shown in FIG. 6, in one embodiment of the present application, a thinned region 135 is provided on the bottom wall of the escape cavity 134a, and the thinned region 135 is configured to provide relief when the pressure relief mechanism 213 is actuated. It is arranged so that it is destroyed by the waste discharged from the inside of the battery cell 20 and can pass the waste to the thinning region 135 . The bottom wall of the escape cavity 134a is thinner than other areas of the thermal management member 13 and is easily destroyed by the exhaust, so when the pressure release mechanism 213 is activated, the exhaust will destroy the bottom wall of the escape cavity 134a and release heat. It can pass through the management member 13.

The thermal management member 13 can form a fluid flow path using a thermally conductive material. The fluid flows through the channels and conducts heat through the thermally conductive material to regulate the temperature of the battery cells 20. Optionally, the thinned region may be free of fluid and have only thermally conductive material, forming a thin layer of thermally conductive material that is susceptible to destruction by exudates. For example, the bottom wall of relief cavity 134a may be a thin layer of thermally conductive material, thereby forming thinned region 135.

Optionally, as shown in FIGS. 7a-7c, in one embodiment of the present application, the thermal management member 13 may include a first thermally conductive plate 131 and a second thermally conductive plate 132. The first heat conduction plate 131 and the second heat conduction plate 132 form a flow path 133 for accommodating fluid. The first heat conductive plate 131 is located between the first wall 21a and the second heat conductive plate 132, and is attached to the first wall 21a. The first region 131a of the first heat conduction plate 131 is recessed into the second heat conduction plate 132 to form an escape cavity 134a, and the first region 131a is connected to the second heat conduction plate 132. In this way, a flow path 133 is formed around the relief cavity 134a, creating a thinned region due to the absence of a flow path within the bottom wall of the relief cavity 134a.

Optionally, the first heat-conducting plate 131 or the second heat-conducting plate 132 of the bottom wall of the relief cavity 134a may also be removed, thereby forming a thinner thinned region. For example, as shown in FIG. 7c, in one embodiment of the present application, a through hole 136 is provided in the first region 131a, and the radial dimension of the through hole 136 is smaller than the radial dimension of the relief cavity 134a; That is, by removing the first heat conductive plate 131 from the bottom wall of the escape cavity 134a and maintaining the connection between the first heat conductive plate 131 and the second heat conductive plate 132 at the bottom edge of the escape cavity 134a, the escape cavity is removed. A flow path 133 is formed around 134a.

Selectively, the second heat conductive plate 132 corresponding to the through hole 136 may be thinned, that is, the thickness of the second heat conductive plate 132 corresponding to the through hole 136 may be changed the thickness of the second thermally conductive plate 132 in the region, thereby making the thinned region more susceptible to destruction by exudates. Optionally, frangible grooves may be further provided in the second heat conductive plate 132 corresponding to the through holes 136.

8a to 8c show schematic diagrams of the thermal management member 13. FIG. As shown in FIGS. 8a to 8c, the first heat conductive plate 131 is recessed to form an escape cavity 134a, and the second heat conductive plate 132 has a weak groove without a flow path in a region corresponding to the escape cavity 134a. 132a is installed, thus, after connecting the first heat conducting plate 131 to the second heat conducting plate 132, the bottom wall of the escape cavity 134a forms a thinned area.

As will be appreciated, still other thinning methods may be employed to thin the bottom wall of the escape cavity 134a, such as forming blind holes or stepped holes in the first region 131a of the first thermally conductive plate 131. and/or a blind hole or the like may be provided in the second heat conductive plate 132.

Optionally, in one embodiment of the present application, the thickness of the thinned region 135 is 3 mm or less. For example, the thickness of thinned region 135 may be 1 mm or less.

In addition to employing the thinned region 135 having a small thickness, a thinned region 135 of a low melting point material may also be employed, which makes it easier to melt into the waste. That is, the thinned region 135 may have a lower melting point than other portions of the thermal management member 13. For example, the material employed by thinned region 135 has a melting point below 400°C.

As will be appreciated, the thinned region 135 may be arranged such that the material has a low melting point and a small thickness, i.e. the above two embodiments may be implemented alone or in combination. It may also be carried out.

Optionally, in one embodiment of the present application, thermal management member 13 is arranged such that when pressure relief mechanism 213 is actuated, it can be ruptured to allow fluid to be expelled from the interior of thermal management member 13.

Specifically, when the pressure release mechanism 213 is actuated, the thermal management member 13 is destroyed and the fluid is discharged from the interior of the thermal management member 13, thus absorbing and discharging the heat of the battery cell 20. The temperature of objects can be reduced, further reducing the risk of emissions. Cooling of the fluid allows the temperature of the effluent of a battery cell 20 to be reduced quickly, without significantly affecting other parts of the battery, such as other battery cells 20, thereby reducing the temperature of a single battery cell 20. Destructiveness caused by abnormality can be suppressed in a timely manner, thereby reducing the possibility of battery explosion.

Optionally, in one embodiment of the present application, a portion of the thermal management member 13 around the escape cavity 134 a is disrupted by the exhaust discharged from the interior of the battery cell 20 to direct fluid from the interior of the thermal management member 13 . It can be discharged.

Specifically, when the pressure release mechanism 213 is activated, the discharge of the battery cell 20 first destroys (breaks through or melts) the thinned region 135, passes through the thinned region 135, and is discharged. The material can escape and destroy the area around the cavity 134a, for example, the hot effluent melts the surrounding thermal management member 13 and the fluid is expelled from the interior of the thermal management member 13, thereby causing the high temperature Reduce the temperature of the exhaust. Because the temperature of the effluent is high, whether the battery cell 20 is heated or cooled by the fluid, the temperature of the fluid is lower than the temperature of the effluent, thus cooling the effluent.

Optionally, in one embodiment of the present application, the sides of the escape cavity 134a can be ruptured by the exhaust to allow fluid to escape from the interior of the thermal management member 13.

When the pressure release mechanism 213 is activated, the discharge from the battery cell 20 rushes into the escape cavity 134a, and since the bottom wall of the escape cavity 134a is thin, the discharge destroys the bottom wall of the escape cavity 134a and the heat management member 13 pass through. Additionally, the ejecta entering the escape cavity 134a also simultaneously melts the sides of the evacuation cavity 134a, allowing fluid to be expelled from the interior of the thermal management member 13, thereby reducing the temperature of the hot ejecta.

Optionally, the radial dimension of the relief cavity 134a gradually decreases in the direction away from the pressure relief mechanism 213. That is, the side surface of the escape cavity 134a is an inclined surface, thus increasing the contact area with the waste and making it easier to be destroyed by the waste. For example, the angular range of the inclination angle of the side surface of the relief cavity 134a (the angle with respect to the plane where the bottom wall is located) may be 15 to 85 degrees.

Optionally, the ratio of the area of the opening of the relief cavity 134a to the area of the pressure relief mechanism 213 should be less than a predetermined value in order to make the sides of the relief cavity 134a susceptible to destruction by the exudate. For example, the ratio of the area of the opening of the escape cavity 134a to the area of the pressure release mechanism 213 may range from 0.5 to 2.

As will be appreciated, in addition to providing the thermal management member 13 with a structure that allows the thermal management member 13 to be destroyed when the pressure relief mechanism 213 is actuated, the pressure relief mechanism 213 is further provided with a structure that allows the thermal management member 13 to be destroyed when the pressure relief mechanism 213 is actuated. A structure can be installed in which the management member 13 can be destroyed.

Optionally, in one embodiment of the present application, a rupture device is installed in the pressure relief mechanism 213, the rupture device rupturing the thermal management member 13 when the pressure relief mechanism 213 is actuated to release fluid from the thermal management member 13. It is used to discharge water from inside. For example, the destructive device may be a spike, and embodiments of the present application are not limited thereto.

Optionally, in one embodiment of the present application, as shown in FIG. 9, the battery 10 may further include an electrical cavity 11a and a collection cavity 11b. Thermal management member 13 is used to separate electrical cavity 11a and collection cavity 11b. The so-called "separation" here refers to separating, and does not need to be sealed.

The electrical cavity 11a is used to accommodate a plurality of battery cells 20. The electrical cavity 11a is further used to accommodate the bus member 12. The electric cavity 11a provides a storage space for the battery cells 20 and the bus member 12, and the shape of the electric cavity 11a can be changed according to the plurality of battery cells 20 and the bus member 12. The bus member 12 is used to electrically connect the plurality of battery cells 20. The bus member 12 can realize electrical connection of the battery cells 20 by connecting the electrode terminals 214 of the battery cells 20.

The collection cavity 11b is used to collect the waste discharged from the interior of the battery cell 20 when the pressure release mechanism 213 is activated.

In the present embodiment, a thermal management member 13 is employed to separate electrical cavity 11a and collection cavity 11b. That is, the electrical cavity 11a for accommodating the plurality of battery cells 20 and the bus member 12 is separated from the collection cavity 11b for collecting the waste. In this way, when the pressure relief mechanism 213 is actuated, the discharge of the battery cell 20 enters the collection cavity 11b, does not enter the electrical cavity 11a, or enters the electrical cavity 11a in a small amount, thereby reducing the electricity in the electrical cavity 11a. without affecting the physical connection, thus improving the safety of the battery.

Optionally, in one embodiment of the present application, the thermal management member 13 is ruptured by the exhaust when the pressure relief mechanism 213 is actuated, allowing the exhaust to pass through the thermal management member 13 and into the collection cavity 11b. It is arranged so that it can be done.

Optionally, in one embodiment of the present application, thermal management member 13 has a wall shared by electrical cavity 11a and collection cavity 11b. As shown in FIG. 9, the thermal management member 13 may be used simultaneously as one wall of the electrical cavity 11a and one wall of the collection cavity 11b. That is, the thermal management member 13 (or a portion thereof) may be used directly as a wall shared by the electrical cavity 11a and the collection cavity 11b, in this way the exhaust of the battery cell 20 is transferred to the thermal management can pass through the member 13 into the collection cavity 11b, and because of the presence of the thermal management member 13, it is possible to separate said effluents from the electrical cavity 11a as much as possible, thereby reducing the risk of the effluents. and improve battery safety.

Optionally, in one embodiment of the present application, the electrical cavity 11a may be formed by a cover with an opening and a thermal management member 13. For example, as shown in FIG. 10, the cover 110 has an opening (lower opening in FIG. 10). The apertured cover 110 is a semi-closed chamber and has an aperture that communicates with the outside, and the thermal management member 13 covers the aperture and forms a chamber or electrical cavity 11a.

Optionally, the cover 110 may be comprised of multiple parts; for example, as shown in FIG. 11, the cover 110 may include a first part 111 and a second part 112. Both sides of the second portion 112 each have an opening, the first portion 111 covers the opening on one side of the second portion 112, and the heat management member 13 covers the opening on the other side of the second portion 112. , thereby forming an electric cavity 11a.

The embodiment of FIG. 11 is obtained by improving on the basis of FIG. Specifically, the bottom wall of the second portion 112 of FIG. 2 is replaced with a thermal management member 13, and the thermal management member 13 becomes one wall of the electrical cavity 11a, thereby forming the electrical cavity 11a of FIG. In other words, the bottom wall of the second part 112 in FIG. Cover to form a chamber or electrical cavity 11a.

Optionally, in one embodiment of the present application, the collection cavity 11b may be formed of a thermal management member 13 and a protection member. For example, as shown in FIG. 12, the battery 10 further includes a protection member 115. The protective member 115 is used to protect the thermal management member 13, and the protective member 115 and the thermal management member 13 form a collection cavity 11b.

The collection cavity 11b formed by the protection member 115 and the thermal management member 13 does not occupy the space that can accommodate the battery cells 20, thus allowing the installation of a collection cavity 11b with a large space, thereby effectively displacing the emissions. can be collected and buffered to reduce the risk.

Optionally, in one embodiment of the present application, a further fluid, such as a cooling medium, may be provided in the collection cavity 11b, or a member for accommodating a fluid may be provided, so that the collection cavity 11b Further reduces the temperature of the incoming exhaust.

Optionally, in one embodiment of the present application, collection cavity 11b may be a closed chamber. For example, the connection between the protection member 115 and the thermal management member 13 can be sealed with a sealing member.

Optionally, in one embodiment of the present application, collection cavity 11b may not be a closed chamber. For example, the collection cavity 11b can be in communication with air, and in this way some of the emissions can be further discharged outside the collection cavity 11b.

In the embodiment described above, thermal management member 13 covers the opening of cover 110 to form electrical cavity 11a, and thermal management member 13 and protection member 115 form collection cavity 11b. Optionally, the thermal management member 13 can directly divide the sealed cover into an electrical cavity 11a and a collection cavity 11b.

For example, as shown in FIG. 13, in one embodiment of the present application, thermal management member 13 is installed inside cover 110 and separates the interior of cover 110 into electrical cavity 11a and collection cavity 11b. That is, the sealed cover 110 forms a chamber therein, and the thermal management member 13 separates the chamber inside the cover 110 into two chambers, an electrical cavity 11a and a collection cavity 11b.

Since the electric cavity 11a requires a large space to accommodate the plurality of battery cells 20, etc., the heat management member 13 may be installed in a position close to the wall where the cover 110 is located, thereby saving a relatively large space. A relatively small space separates an electric cavity 11a and a collection cavity 11b.

Optionally, as shown in FIG. 14, in one embodiment of the present application, cover 110 may include a first portion 111 and a second portion 112. An opening is provided on one side of the second portion 112 to form a semi-closed structure. A semi-closed structure is a chamber with an opening. The thermal management member 13 is installed inside the second part 112, and the first part 111 covers the opening of the second part 112. In other words, the thermal management member 13 is first placed within the semi-enclosed second part 112 to separate the collection cavity 11b, and then the first part 111 is covered over the opening of the second part 112 to separate the electrical cavity. 11a is formed.

Optionally, in one embodiment of the present application, the electrical cavity 11a is separated from the collection cavity 11b via a thermal management member 13. That is, the collection cavity 11b does not communicate with the electrical cavity 11a, and the liquid or gas etc. in the collection cavity 11b cannot enter the electrical cavity 11a, thereby better protecting the electrical cavity 11a.

FIG. 15 is an exploded view of the battery 10 of one embodiment of the present application. In the embodiment shown in FIG. 15, the thermal management member 13 is provided with an escape cavity 134a and forms a collection cavity with the protection member 115.

For a description of each component of the battery 10, refer to the above embodiments, and for the sake of brevity, the description will not be repeated here.

One embodiment of the present application further provides a power consuming device, which may include the battery 10 of each of the above embodiments. Optionally, the power consumer may be a vehicle 1, a ship or a spacecraft.

In the above, the battery and the power consuming device according to the embodiment of the present application have been explained, but below, the battery manufacturing method and device according to the embodiment of the present application will be explained, and the parts not explained in detail will be explained in each of the above embodiments. Please refer to .

FIG. 16 shows an exemplary flowchart of a method 300 for manufacturing a battery according to one embodiment of the present application. As shown in FIG. 16, the method 300 includes steps 310, 320, and 330.

Step 310: providing a battery cell 20, the battery cell 20 including a pressure relief mechanism 213, at least a portion of the pressure relief mechanism 213 protruding from the first wall 21a of the battery cell 20; It is used to activate and release the internal pressure or temperature when the internal pressure or temperature reaches a threshold value.

Step 320: providing a thermal management member 13 that is used to contain a fluid and has an escape cavity 134a disposed on its first surface.

Step 330: attaching the first surface of the thermal management member 13 to the first wall 21a of the battery cell 20, and accommodating at least a portion of the pressure relief mechanism 213 in the relief cavity 134a.

FIG. 17 shows an exemplary block diagram of a battery manufacturing apparatus 400 according to one embodiment of the present application. As shown in FIG. 17, the battery manufacturing apparatus 400 may include a providing module 410 and an attaching module 420.

The providing module 410 provides the battery cell 20, the battery cell 20 includes a pressure release mechanism 213, at least a portion of the pressure release mechanism 213 protrudes from the first wall 21a of the battery cell 20, and the pressure release mechanism 213 is connected to the battery cell 20. a thermal management member that is used to operate to release the internal pressure or temperature when the internal pressure or temperature of 20 reaches a threshold value, is used to contain a fluid, and has an escape cavity 134a located on the first surface; 13.

The attachment module 420 is used to attach the first surface of the thermal management member 13 to the first wall 21a of the battery cell 20 and to accommodate at least a portion of the pressure relief mechanism 213 in the escape cavity 134a.

Note that the above embodiments are merely for explaining the technical proposal of the present application, and are not intended to limit it. Although the present application has been described in detail with reference to the above embodiments, it is still possible to modify the technical solutions described in each of the above embodiments or modify some technical features thereof, as can be understood by those skilled in the art. Equivalent substitutions may be made, and these changes and substitutions do not deviate the essence of the corresponding technical solution from the spirit and scope of the technical solution according to each embodiment of the present application.

1 Vehicle 10 Battery 11a Electrical cavity 11b Collection cavity 12 Bus member 13 Thermal management member 20 Battery cell 21 Battery case 21a First wall 22 Electrode assembly 23 Current collecting member 23 Connection member 24 Pad 30 Controller 40 Motor 110 Cover 111 First portion 112 Second portion 115 Protective member 131 First heat conductive plate 131a First region 132 Second heat conductive plate 132a Fragile groove 133 Channel 134a Cavity 135 Thinned region 136 Through hole 211 Housing 212 Cover plate 213 Pressure release mechanism 214 Electrode terminal 214a Positive electrode terminal 214b Negative electrode terminal 221a First tab 222a Second tab 400 Manufacturing device 410 Providing module 420 Installation module

Claims (14)

A battery,
The battery cell includes a pressure relief mechanism, at least a portion of the pressure relief mechanism protrudes from a first wall of the battery cell, and the pressure relief mechanism is configured to operate when the internal pressure or temperature of the battery cell reaches a threshold value. a battery cell used to operate to release the internal pressure;
a thermal management member for containing fluid and regulating the temperature of the battery cell;
A first surface of the thermal management member is attached to the first wall of the battery cell, and the first surface of the thermal management member has an escape cavity for accommodating the at least a portion of the pressure relief mechanism. installed ,
The escape cavity is configured to provide a deformation space for the pressure relief mechanism to allow the pressure relief mechanism to deform toward the thermal management member and rupture. 2. The pressure relief mechanism according to claim 1, wherein a portion of the first wall around the pressure relief mechanism protrudes outwardly, and the escape cavity is further used to accommodate the protrusion portion of the first wall around the pressure relief mechanism. Batteries listed. the depth of the relief cavity is related to the dimensions of the pressure relief mechanism; and/or
2. The battery of claim 1 , wherein the relief cavity has a depth of greater than 1 mm. A thinned region is installed in the bottom wall of the escape cavity, and the thinned region is destroyed by the exhaust discharged from the inside of the battery cell when the pressure release mechanism is activated, and the thinned region is disposed in the bottom wall of the escape cavity, and the thinned region is destroyed by the exhaust discharged from the inside of the battery cell when the pressure release mechanism is activated. located in such a way that it can pass through the
The battery according to any one of claims 1 to 3, wherein the thickness of the thinned region is 3 mm or less. the thinned region has a lower melting point than other portions of the thermal management member;
5. The battery of claim 4 , wherein the material employed by the thinned region has a melting point below 400<0>C. The heat management member includes a first heat conduction plate and a second heat conduction plate, the first heat conduction plate being located between the first wall and the second heat conduction plate and attached to the first wall. Claims 1 to 5, wherein the first region of the first heat-conducting plate is recessed into the second heat-conducting plate to form the escape cavity, and the first region is connected to the second heat-conducting plate . The battery according to any one of the above. The battery according to claim 6 , wherein a through hole is installed in the first region, and a radial dimension of the through hole is smaller than a radial dimension of the escape cavity. The battery according to claim 7 , wherein the thickness of the second heat conductive plate corresponding to the through hole is smaller than the thickness of the second heat conductive plate in other areas. A portion of the thermal management member around the escape cavity can be destroyed by waste discharged from the interior of the battery cell to cause the fluid to be discharged from the interior of the thermal management member. The battery according to any one of the above. 10. The battery of claim 9 , wherein the sides of the escape cavity are ruptured by the exudate to allow the fluid to exit from the interior of the thermal management member. 11. The battery of claim 10 , wherein the radial dimension of the relief cavity gradually decreases in a direction away from the pressure relief mechanism. The battery further includes:
an electrical cavity for accommodating a plurality of the battery cells;
a collection cavity for collecting exhaust emitted from the interior of the battery cell when the pressure relief mechanism is activated;
A battery according to any preceding claim, wherein the thermal management member is used to separate the electrical cavity and the collection cavity. the thermal management member has a wall shared by the electrical cavity and the collection cavity; and/or
The battery further includes a protective member,
the protective member is used to protect the thermal management member, the protective member and the thermal management member forming the collection cavity;
10. The thermal management member is arranged to collapse upon the exhaust when the pressure relief mechanism is actuated to allow the exhaust to pass through the thermal management member and into the collection cavity. 12. The battery according to 12 . A power consuming device comprising the battery according to any one of claims 1 to 13 .

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